Tertiary amines and methods for obtaining the same



Patented Oct. 30, 1951 UNITED sv'ras P'ATENT o F ce.

TERTIARY AMINES AND METHODS FOR V OBTAINING THE SAME George Rieveschl, Jr., Grosse-I'ointe Woods, and William R. Coleman, Grosse Pointe, Mich., as- 1 signers to Parke, Davis & Company, Detroit,

Mich., a corporation of Michigan No Drawing.

where R is a lower alkyl or alkenyl radical, R1 is hydrogen or methyland X is a chlorine or bromine atom.

It has been discovered that the compounds of the invention may be obtained by the action of a halogenating agent on a compound of the formula,

, R cnu r-omorgon where R and R1 have the same significance as given above. Some of the halogenating agents which may be used to effect this transformation are thionyl chloride, thionyl bromide, constantv boiling hydrobromic' acid, phosphorus oxychloride, phosphorus oxybromidaphosphorus trichloride, phosphorus tribrOmi'de, phosphorus penta chloride and the like. The reaction may be carried out by heating the two reactants for a short time in the presence'or absence of a solvent. In'

some cases, such' as when phosphorus oxychloride, constant boiling hydrobromic acid or thionyl chloride are used as the halogenating agent, an excess of the reagent serves both as a solvent and as a reactant. However, when halogenating agents such as phosphorus trichloride or thionyl bromide are used it is preferable to carry out the reaction in an inert organic solvent such as benzene, toluene or xylene;

The compounds of the present invention are powerful sympatholytic agents. and because of this ability to block the pressor effect of epinephrine they are especially useful in the treatment of peripheralvascular diseases and neu rogenic hypertension.

tamine activity. I preferably as the salts of the base s,'either orally or intravenously. The usual intravenous dosage is about 10' to 20 mg. while the oral dosage is about50to 100 mg. t

These compounds also. possess anextremely highdegree of anti-his- They may be administered,

Application December 2, 1946, Serial No. 713,461

I 7 Claims. (Cl. 260-570.9)

The invention is illustrated by" the following e a pl fi L 2;:3. Example 1.-,3'-Chl0roeth yZ methyl l-naphthyl mahyzamme 21.5 g. of fJ-hydroxyethyl methyl 1 naphthyl methyl amine is dissolved in 150 cc. of benzene and the resulting; olutionadded. slowlyv with; stirring to a refiuxingsolution of 13 cc. of thionyl chloride in 100 cc of benzene. The reaction mixture is stirred and refluxed for three hours, cooled and the crystalline hydrochloride of 13- chloroethyl methyl l-naphthyhnethyl amine removed by filtration. After two recrystallizations from isopropanol the purified hydrochloride salt melts at 198-9 C.

Example 2.-fi-Chloroethyl ethyl i-naphthylmethyl amjne'-. ees I v omN -cm'omo1';

A' solution of 122.9 g. offl-hydroxyethylethyl l-naphthylmethyl' amine in] 109 cc. of" "benzene added slowly'yvithstirring to"a Warm'solution of 13 cc. of thionyl'chloride in ccfof'ibnzeriel' Th'e'mixture 'is'refluxed for about'one half hoj" V ",f cooled and th'e'crystalline hydrochloride saw-tr the desired produc t collected. ,After recrystallizati'on from isopropan'olfthe. purified hydrochloride of fi-chloroethyl ethyll-naphthylmethyl amine melts at 1'71-2 -C'.

Example 3. jB mmah-yz ethyl I-naphthylmethyl amine, omens: 4 CHEN-QEiQHZQI the crystalline; drokiromide salt fof". fie hrdrnoj ethyl ethyl l-naphthylmethyl amine removed by filtration. If desired, the crude salt may be purified by. recrystallization from; methanoh acetone; M. P. 167-8 0.

Example 4.-p-Chloroethyl h proziyl f-mplitfiyl methyl amiiz'e CHaCEE:

cmN-omcnlcir 50 cc. of thionyl chloride is cooled by nieans" n-propyl l-naphthylmethyli amine added dropwise with stirring. After ,the addition has been completed the mixture iswarmed on a steam bath for fifteen minute's?" Whenebol, the reaction mixture is diluted with about 409cc. oi dry ether and the crystalline hydrochloride of p-chloroethyl n-propyl l-naphthylmethyl aniline; removed by filtration. The hydrochloride salt after purification byrecrystallization from isdiiropanol melts stress d? c1 a ring to 30 cc. of ice-cold thionyhchloride. After the addition has been completed, the mixture is allowed to come to room temperature slowly. The reaction mixture is then .hated on a steam bath for about thirty minutes, cooled and diluted to time o of about" 4 0 0 ie'c." with]. ether. Th ystallinehydfoclilorid salt-of fi 'ch ibet iso-p'r'o'pyl I-napIithyImetIiyl amine is'colf-e rest d and purified by reoi ystall'iz'atibn from niethanor-isopropanoi mixture: M: P: 182-3 0;

A solution of 24.1 g. of fi' hydroxyethyl allyl 1- naphthylmethyl amine 25 ec. of benzene is added dropwise with stirring to- 30"cc. of thionyl chloride cooled by means offan, ice bath. After itself 11 1191 twenty? nute'si ;'di'l'utd' to about 400 c.

wit emanated me commuct which sepii a. A m hs; rybb iip esents; The crystalline hydrochloride of 'p-e'liiorbethyl imam; i

MW f; collected, washed with ether and pur ed by recrystallization from isopropanol-ether mixture; M. P. 160-3 C.

i lyli i. ami

Example 7.-p-C'hloroethyl n-butyl l-naphthylmethyl amine cmomcmon. 10 on, CH:CH:C1

.2547 g. tri l-nib" et y mi e d ss lyed. 1 1.1 9 so; 0 benz ne I Ma a. 'r- -s I ST 1: fluxed for four hours, codled and diluted;w th petroleum ether. The oil which separates is rubbed until it crystallizes and the crystalline hydrochloride of fi clilbr oethyfn-butyl l-naphthylmethyl amine collected. The crude hydrochloride salt can be recrystalliz ed ii'oni isopropanolpetroleum ether mixture to obtainthe pure salt melting at 145-6 C.

CH cinch CH1N-CHICH1C1 A solution of 25 g. of p-hydroxyethyl iso-butyl ,7 endithe a The mixtureis c'oole 500' c. a

eti z zmdianm zr 25 got p-hydroxyethyl n-amyl l-naphthylmethyl amine is dissolved in 100 cc. of benzene and the resulting solution added slowly with stirring to a refluxing solution of cc. of thionyl chloride in 100 cc. of benzene. The reaction mixture is stirred and refluxed for three hours and then cooled. The crystalline hydrochloride of fl-chloroethyl n-amyl l-naphthylmethyl amine is removed by filtration a'nd purified by recrystallization from isopropanol-ether mixture.

Example 11.p-Bromoethyl n-hexyl 1-naphth'ylmethyl amine cmcmomomcmom g. of fi-hydroxyethyl n-hexyl l-naphthylmethyl amine is mixed with 500g. of constant boiling hydrobromic acid'and the resulting solution refluxed for four hours. The condenser is set for distillation and the hydrobromic acid slowly distilled off until the residue has a volume of about 100 cc. The residue is cooled, diluted with acetone and the crystalline hydrobromide of fi-bromoethyl n-hexyl l-naphthylmethyl amine collected and purified by recrystallization from isopropanol-ether mixture.

Example 12.,8C'hloropropyl ethyl I-naphthylmethyl amine Example 13.,B-Chloropropyl allyl I-naphthylmethyl amine CHzCH=CHz CHzNOH2CH-Cl I JHa A solution of 25 g. of fl-hydroxypropyl allyl l-naphthylmethyl amine in 100 cc. of dry benzene is added dropwi'se to a refluxing solution of 15 cc. of thionyl chloride in 150 cc. of dry benzene and the resultant mixture refluxed for four hours. The mixture is cooled, the crystalline hydrochloride of fi-chloropropyl allyl l-naphthylmethyl amine collected and purified by recrystallization' from isopropanol.

Example 14.+5-Bromopropyl iso-propyl I -naphthylmethyl amine OH: as v CHa cmN-omcH-Br A solution of 25 g. of p-hydroxypropyl isopropyl l-naphthylmethyl amine in 500 g. of constant boiling hydrobromic acid is heated under reflux for three hours. The condenser is set for distillation and the hydrobromic acid distilled off slowly until the residue reaches a volume of approximately cc. After cooling, acetone is added to the residue to precipitate the hydrobromide salt of the desired ,B-bromopropyl isopropyl l-naphthylmethyl amine. The crude salt is collected and purified by recrystallization from isopropanol-ether mixture.

While the above examples deal primarily with the production of the hydrohalide salts of the new B-haloalkyl ,alkyl or alkenyl l-naphthylmethyl amines, it should be understood that the invention also includes other acid addition salts of inorganic and organic acids. Some examples of these other salts are the citrates, benzoates, acetates, oxalates, tartrates, sulfates, phosphates and the like. These salts may be prepared from the free bases of the new tertiary amines. For example, the citrate salt of ,B-chloroethyl methyl l-naphthylmethyl amine, the compound of Example 1, may be prepared as follows.

25 g. of p-chloroethyl methyl l-naphthylmethyl amine hydrochloride is dissolved in cc. of water and the resulting solution made alkaline in the cold by the addition of 10% sodium hydroxide solution. The free base is extracted from the alkaline solution with ether, the combined ether extracts dried for a few minutes over anhydrous potassium carbonate and the drying agent removed by filtration. The ether solution of the free base is added to a solution of 17 g. of citric acid in 500 cc. of ether (plus a small amount of absolute ethanol to increase the solubility of the citric acid). The citrate salt which separates from the solution as a fine white powder is collected and purified by repeated washing withether.

Other salts such as the oxalate of p-chloroethyl methyl l-naphthylmethyl amine may be prepared by evaporation of the ether from an ether solution of the free base and adding the base to a warm solution of isopropanol containing at least one equivalent of oxalic acid. Ethyl acetate is added and on cooling the acid oxalate of p-chloroethyl methyl l-naphthylmethyl amine crystallizes out.

In its broader aspects the invention also includes the quaternary ammonium compounds derived from the B-haloalkyl alkyl and alkenyl 1- naphthyl amines. The quaternary ammonium halides may be prepared by treating a free base of the new l-naphthylmethyl amines with an alkyl or aralkyl halide such as methyl 'iOdiCIQ-fllfl bromide, benzyl chloride and the like, in an inert organic solvent. The quaternary ammonium sulfonates and sulfates can be prepared in an analogous manner by using reagents such as. dimethyl sulfate, methyl benzene sulfonate and methyl toluene sulfonate insteadof ithe alkyL-or aralkyl halides. Some examples of the compounds which can be prepared by these methods are fi-chloropropyl dimethyl l-naphthylmethyl ammonium iodide, fi-chloroethyl ethyl methyl 1- naphthylmethyl ammonium benzene sulfonate, fi-chloroethyl diethyl 1-naphthylmethyl ammonium p-toluene sulfonate, B-chloroethyl dimethyl l-naphthylmethyl ammonium methosulfate and B-chloroethyl ethyl -benzyl 1-naphthylmethyl ammonium chloride.

The substituted 5-hydroxyalkyl l-naphthylmethyl amines used as starting materials for the preparation of the new halo aminesv of the present invention may be prepared as described in our copending application, Serial No. 713,462, filed on even date herewith.

'What we claim as our invention is;

"1. A compound of the class consisting of a free base and. its acid addition salts, said free "base having the formula, Y

where .R is a m r o t e la s consist ng 01 lower alkyl and lower alk nyl radicals, Br 118.2.

member of the ass onsistin Qfhydrosen and. methyl and X is a member of the class consist ing chlorine and bromine.

2. An acid addition salt of a compound-havin theformula,

CHz-N-GHzCHzCI,

where Ris a lower alkyl radical;

3. An acid addition salt of a compoundhavi'ng the formula,

where R is a lower alkylradical.

A hydrochloride salt of a compound having the formula,

om-oH-om :om-N-omcmm 5. The compound having the formula:

' QzHs ,OHr-NCH2-,C H2Gl 6. A compound of the class consisting of a. free base and its acid addition salts, said free base having the formula,

CzHs V CHaN- CH2 QHz-X where X is a member of the class consisting of 0 Cland'Br.

'Z. The compound having the formula,

GHzN-CH: GHz-Br 40 GEORGE RIEVESCHL, JR.-

WILLIAM R. COLEMAN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES vP'A'TENTS OTHER REFERENCES 'wedekinmi Ann.,. .471, ,pp'. 73-112 (1929);. 

1. A COMPOUND OF THE CLASS CONSISTING OF A FREE BASE AND ITS ACID ADDITION SALTS, SAID FREE BASE HAVING THE FORMULA. 